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317 results about "Cryopump" patented technology

A cryopump or a "cryogenic pump" is a vacuum pump that traps gases and vapours by condensing them on a cold surface, but are only effective on some gases. The effectiveness depends on the freezing and boiling points of the gas relative to the cryopump's temperature. They are sometimes used to block particular contaminants, for example in front of a diffusion pump to trap backstreaming oil, or in front of a McLeod gauge to keep out water. In this function, they are called a cryotrap, waterpump or cold trap, even though the physical mechanism is the same as for a cryopump.

High conductance cryopump for type iii gas pumping

A cryopump provides for high pumping speed of Type III gases. An open configuration of a frontal array provides high conductance of gases into a radiation shield which is shaped to focus gases toward a second stage array. The second stage array has an open configuration of baffles coated with adsorbent. Substantially all of the adsorbent has a direct line of sight to the radiation shield or to the opening in the radiation shield, and substantially all of the baffles are coated with adsorbent. In one form, the second stage cryopump array comprises an array of discs fanned to define a generally ball shaped envelope.
Owner:EDWARDS VACUUM LLC

Method for reducing particulate generation from regeneration of cryogenic vacuum pumps

InactiveUS6116032AReduces the thermal and mechanical shockSolidificationLiquefactionParticulatesProcess engineering
A method for reducing particulate generation from regeneration of cryogenic vacuum pumps. The method comprises controlling a pressure ramp rate inside the cryopump during an initial introduction of a regeneration gas into the cryopump. Preferably, the pressure ramp rate is controlled by maintaining a first pressure ramp rate, preferably between about 0.03 T / s and 0.15 T / s, until a first pressure of about 0.3 T is reached inside the cryopump and maintaining a second pressure ramp rate between about 1 T / s and 5 T / s until the surface in the cryopump reaches an intermediate temperature between about 40 K and 100 K. Preferably, the temperature ramp rate is also controlled by heating the surface at a temperature ramp rate between about 0.1 K / s and about 0.5 K / s until the intermediate temperature has been reached. Preferably, the temperature ramp rate is controlled by regulating the flow of an inert gas into the cryopump using a flow restriction device. Alternatively, the second stage cryoarray temperature is increased at the rate of between 0.1 K / s and 0.5 K / s using a PID controlled heater.
Owner:APPLIED MATERIALS INC

Refrigerant phase transformation-free refrigerator for recovering liquefied natural gas (LNG) cold energy

InactiveCN101619914ARealize cold energy recoveryRealize cold energy utilizationDomestic cooling apparatusLighting and heating apparatusRefrigerator carLiquid state
The invention relates to a refrigerant phase transformation-free refrigerator for recovering liquefied natural gas (LNG) cold energy, which belongs to the technical fields of energy saving and refrigeration. The refrigerant phase transformation-free refrigerator for recovering LNG cold energy comprises an LNG storage tank, an LNG cryopump, an LNG carburetor, an LNG-refrigerant heat exchanger, a refrigerator heat exchanger, a refrigerator fan, a refrigerant low-temperature storage tank, a low-temperature refrigerant pump and various flow valves. R410A is selected as refrigerant to sequentially enter all refrigerators after obtaining refrigeration amount from LNG, the refrigerant releases the refrigeration amount step by step, and the step utilization of the cold energy is realized. The refrigerant is run in a complete liquid state in the whole process and does not generate phase transformation in heat exchangers of all the refrigerators; and the refrigeration amount transformation needed by the refrigerators is realized by adjusting the rotating speed of the fan and the flow of the refrigerant. The invention has the obvious effects of saving the energy and reducing the discharge.
Owner:SHANGHAI JIAO TONG UNIV

Clean vacuum system used for engine plume test research and vacuumizing and repressing method thereof

InactiveCN102359859AVarious working modesThe pumping speed is adjustableAerodynamic testingEngine testingGas analysisNitrogen
The invention provides a clean vacuum system used for engine plume test research and a vacuuminzing and repressing method thereof, belonging to the technical field of engine vacuum science. The clean vacuum system comprises a low vacuum system, a low vacuum liquid nitrogen cold trap system, a high vacuum system, a high vacuum liquid nitrogen cold trap system, a low temperature pump liquid nitrogen supply system A, a low temperature pump liquid nitrogen supply system B, an air repressing system, a nitrogen repressing system, a container vacuum measuring system, a residual gas analysis system, a liquid nitrogen heat sink, and a liquid nitrogen heat sink and plume adsorption pump. In the clean vacuum system, the vacuum is obtained mainly relying on the clean low vacuum system, the high vacuum system and the liquid nitrogen heat sink, the liquid nitrogen heat sink and plume adsorption pump; various clean vacuum degrees required by the plume test can be obtained, and the highest ultrahigh dynamic vacuum degree of 10<-6> Pa can be obtained. Both the low vacuum system and the high vacuum system are configured with the liquid nitrogen cold trap system which is used for absorbing the oil steam produced by working of a mechanical pump, so that the cleanness of the vacuum container can be ensured.
Owner:BEIHANG UNIV

Two engine system with a gaseous fuel stored in liquefied form

A gaseous fuelled two engine system is disclosed comprising a high pressure direct injection engine as the main power source and an auxiliary fumigated engine that can be fuelled with vapor removed from a storage tank that stores the gaseous fuel in liquefied form at cryogenic temperatures. The fuel supply system comprises a cryogenic pump for raising the pressure of the fuel to the injection pressure needed for the high pressure direct injection engine, and the cryogenic pump is powered by the auxiliary fumigated engine.
Owner:WESTPORT POWER

Device and method for recovery and reliquefaction of boil-off gas of liquefied natural gas

ActiveCN102182919ASimple recycling processSimplify liquefaction system processPipeline systemsEngineeringDistributor
The invention relates to a device for the recovery and reliquefaction of boil-off gas of liquefied natural gas, which comprises a storage tank with a safety valve and a low-temperature pump, wherein a first interface is formed between the storage tank and the safety valve and is connected with a recovery pipe; the low-temperature pump is provided with a second interface; the other end of the recovery pipe is communicated with a recovery compressor; an outlet of the recovery compressor is connected with a cooler, an oil-gas separator and a boil-off gas distributor, and first boil-off gas and second boil-off gas are respectively discharged from the boil-off gas distributor; the first boil-off gas is communicated with a screw expansion machine and enters a heat exchanger and a second screw compressor; the second boil-off gas is connected with the second interface of the low-temperature pump by the heat exchanger, a throttling valve and a gas-liquid separator; and the liquefied natural gas enters the storage tank. The device has the advantages that by using a screw expansion-compressor set refrigerating reliquefaction method of recovering the boil-off gas directly by the screw compressors and taking the boil-off gas as a refrigerant directly, system flow equipment is simplified, energy waste is avoided, and peripheral environmental pollution and potential safety hazards are avoided, so obvious economic and social benefits are created; and a system runs automatically, continuously and circularly, and has the excellent running work condition and high using efficiency and runningreliability.
Owner:NINGBO BAOSI ENERGY EQUIP

Method and equipment for dynamically recycling evaporated gas of liquefied natural gas

The invention discloses a method and equipment for dynamically recycling evaporated gas of liquefied natural gas. The method includes firstly, monitoring density, temperature and pressure data of the evaporated gas of the liquefied natural gas stored in a storage tank; secondly, computing and preliminarily judging super-cooling quantities required by the liquefied natural gas stored in the storage tank according to the monitored data; thirdly, enabling propane media to be in refrigerating cycles and then inputting the super-cooling quantities into the liquefied natural gas stored in the storage tank via heat exchange; fourthly, enabling the liquefied natural gas in a super-cooling state to return the storage tank by means of circulation, enabling the liquefied natural gas in the storage tank to reach new super-cooling state balance, dissolving evaporated gas generated in the liquefied natural gas into the liquefied natural gas again and reducing evaporation quantities by 80%; fifthly, starting to execute the first step, the second step, the third step and the fourth step again when the evaporated gas of the liquefied natural gas stored in the storage tank is layered. The equipment comprises the liquefied natural gas storage tank, a low-temperature pump, a heat exchanger, a refrigerating plant, a sensor and a control device. The method and the equipment have the advantages that the evaporated gas of the liquefied natural gas can be dynamically recycled, and the equipment can run stably without being frequently started and stopped and is high in safety and low emission and operating cost.
Owner:CHINA NAT OFFSHORE OIL CORP +1
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